Under magnification, I believe the serial number is 830, but dont hold my feet to this guess. The face of the coil never touched the ground but has a few scuff marks due to sand getting inside the protected cover.
There is some scuff marks on the decal (BigFoot) area. The item "Whites BIGFOOT Coil for DFX and MXT Detectors" is in sale since Thursday, September 13, 2018. This item is in the category "Business & Industrial\Test, Measurement & Inspection\Test Meters & Detectors\Metal Detector Accessories". The seller is "captjim49" and is located in Sun City, Arizona. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica.